CNC Machining Services for Custom Precision Parts — Factory-Direct

Where CNC Money Actually Goes

Ask five suppliers for the same drawing and their prices will span 3×. The drawing did not change; their interpretation of it did. Machining cost decomposes into five buyable ingredients, and every quote you will ever receive is these in different proportions: (1) Stock — material cost plus the saw/blanks prep, dominated by whether the grade is on a shelf or a purchase order. (2) Setup — fixture design, indicating, first-article proofing; a fixed dollar amount per operation that volume must amortize. (3) Cutting time — the machine-hours themselves, driven by how much metal leaves the part and how fast the tools can run in that alloy. (4) Rework risk — thin walls, deep pockets, GD&T stacks that make scrap likely; honest shops price it, silent shops give you a surprise instead. (5) Finishing and paperwork — anodize racks, reports, packaging. When a quote looks cheap, one of these five is hiding; when one looks expensive, it is usually a solvable geometry conversation.

This is also why the quantity curve matters more than the unit price. At 10 pieces, setup is the story and the cheapest shop per piece is often the most expensive shop overall — their low rates usually mean slower machines, and slow machines multiply where your setup re-runs. At 1,000 pieces the story flips to cycle time and tool life. Our quotes print both curves side by side so the decision is visible, not negotiated.

How to Verify a CNC Supplier Before the First PO

Buyers who have been burned once all converge on the same short audit list; run it on any supplier, including us, and treat evasion as an answer:

• Show me the machine that will run my part. Not a brand logo wall — the actual cell, mid-cut, with a chip conveyor running. A shop that films their own floor within a day is telling you the truth about capacity.
• Show me a dimensional report for a part like mine. Same family of geometry, features gauged feature-by-feature. Generic certificates of conformance with tick-boxes prove nothing; measured numbers prove a lot.
• Tell me what you would change about my drawing. A supplier with real engineering answers with specifics in 24 hours; a broker forwards your file and waits.
• Name the inspection instrument for each critical feature. Micrometer, bore gauge, CMM, thread gauge, surface tester — each feature implies a tool. Vague QC language means the features will not be measured.
• What happens when a batch fails? The correct answer has a timeline: photos in, retained-sample re-gauge, remake or credit, freight on them. Read their service guide before you need it.

'Standard Tolerance' in Plain English

±0.05 mm (about ±0.002″) sounds precise but is really a contract about average behavior: on 6061 aluminum, at 20 °C, on features under ~150 mm, measured after stress relief and before finishing, our cells hold it as a matter of routine. Four practical caveats that any honest machinist will confirm: long thin parts spring and want either thicker sections or soft-finishing passes; anodize grows outer dimensions (plan mask or clearance); flatness on machined-from-solid plates beats flatness on laser-cut plate by an order of magnitude; and a tolerance stack of six ±0.05 features is ±0.3 of accumulated drama — call the two features that matter, and let the drawing rest. Mark the features that genuinely need ±0.01 mm, accept standard everywhere else, and your parts arrive cheaper and match more often — the opposite of over-specifying everything and being disappointed by everything.

Every claim on this page is shop-verifiable: machine list, gauge types, and tolerance capability sheets are available at RFQ — ask, and the numbers arrive with the quote.